Heney m



(No Model.)

v H. M. BYLLESBY.

- I ELECTRIC CONVERTER. No. 366,375. Patented July 12,1887.

wuawtoz UNITED STATES PATENT OFFICE.

HENRY M. BYLLESBY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO GEORGEWESTINGHOUSE, JR, OF SAME PLACE.

ELECTRIC CONVERTER.

SPECIFICATION forming part of Letters Patent No. 366,375, dated July 12,1887.

Application filed January 10, i887. Serial No. 223.871. (No model.)

T aZZ whom it may concern.-

Be it known that l, HENRY M. BYLLES'BY, a citizen of the United States,residing in Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inElectric Gonverters, of which the following is a specifica tion.

The invention relates to the construction of induction-coils or electricconverters, and espeeially to that class of converters in which a coreis made up of thin sheets of soft iron formed with rectangular openingsthrough 1 which the coils extend.

The object of the invention is to insure that the coils shall bethoroughly insulated from each other, and also from the surroundingiron. To this end the primary and secondary coils are separately woundand wrapped with suitable insulating material, and they are separatedfrom each other a slightdistance by suitable insulating 1naterialsuch,for instance, as leatheroid or white fiber. Narrow strips of the same.material are preferably placed between the remaining sides of the coilsand the surrounding metal. 1

In the accompanying drawings, Figure l is a section of a converterconstructed upon the principle of this invention; and Fig. 2 is a sideview of the same.

Referring to the figures, P represents the primary and S the secondarycoil of an electric converter. These coils are separately wound, and arethen covered with suitable non-conducting materialsuch, for instance,

as bands of cotton cloth or canvas wound upon them and coated withshellac or other nonconducting material. The coils are then placed sideby side, being separated by strips or plates of leatheroid or whitefiberor other suitable non-conducting substance, as shown at a. Narrow stripsof the same material are bound against the sides of the coils, as shownat a a. The core of soft iron is then applied.

' This core is preferably built up of thin sheets of soft iron, (shownat 1),) the plates being preferably formed with rectangular openingsslightly larger than the coils, thus allowing for the space occupied bythe strips ct a and intervening air-spaces for cooling and ventilating.The plates are cut open, as shown at e e, and the sides e e are benthack temporarily to allow the central t0ngue.f, to be inserted withi nthe coils. This form of core is described in an application for LettersPatent filed by Albert Schmid December 27, 1886, and no claim is hereinmade upon the construction of t-hecore itself.

I claim as my invention L'The combination, with the primary andsecondary coils of a converter, separately wound and covered withinsulating material, of plates of non-conducting material between saidcoils, strips of non-conducting material extending along the sides ofthe coils, and a core of soft iron surrounding the coils, leavingairspaces between said strips.

2. In an electric converter, the combination, with' the primary andsecondary coils separaiely wound, of plates of insulating materialbetween the coils and strips of insulating material extending along thesides of the coils and separating the same from the surrounding core,substantially as described.

3. The combination, in an electric converter, of a core built up ofplates or sheets of soft iron magnetically insulated from each other,and having rectangular openings, primary and secondary coils within saidopenings, and strips of insulating substance separating the coils fromthe core, substantially as described.

In testimony whereof I have hereunto subscribed my name this Sth day ofDecember, A. D. 1886.

HENRY M. BYLLESBY.

Witnesses:

J. G. BAOKOFEN,

CHARLES A. TERRY.

